GE Tigers started out as unquestionably the top team in Korea in their first season in the LCK, in first place with a 7-0 match record and a 14-2 game record at the end of week 6 of the spring season. This placement earned them an invitation to the IEM Season IX World Championship in March. However, after defeating Cloud 9 and SK Gaming to win their group, they lost in the semifinals 2-1 to Team WE - who entered the competition as the 12th-place team in the LPL. This led many casters and analysts to label it the biggest upset to date in the entire history of competitive League of Legends. After their return to Korea, the GE Tigers's record worsened, and they dropped sets to both KT Rolster and to SK Telecom T1. They still finished first in the round robin with a 12-2 record, but in the Playoffs they lost to SKT and missed out on the Mid-Season Invitational. Prior to the start of the SBENU Champions Summer 2015, the GE Tigers were sponsored by streaming company KOOtv and changed their name to the KOO Tigers. KOO ended the regular season of Champions Summer in 4th place.They beat NaJin e-mFire 2-1 and CJ Entus 3-0 to advance to the semifinals where they played a close series with KT Rolster but lost 3-2, ultimately ending in third place. Because SKT won the finals, KOO automatically qualified for the 2015 World Championship as the second seed from Korea with the most circuit points. KOO was placed into a group with Counter Logic Gaming, Flash Wolves, and paiN Gaming. They placed second, ending with a 4-2 record with both losses to Flash Wolves. They beat KT Rolster 3-1 and Fnatic 3-0 to make it to the finals against SKT. However, they finally fell in the finals with a 3-1 loss.

2016 Preseason

After Worlds, Tigers dropped their title sponsor from their team name, and they played in the KeSPA Cup as Tigers. The Tigers played in the KeSPA Cup but they were upset in the first round 2-0 by SBENU Sonicboom. On January 5th they renamed to the ROX Tigers.

2016 Season

During the 2016 LCK Spring Split, the ROX Tigers dominated domestically in similar fashion to 2015. They finished the regular season with a 16-2 match record, losing only to KT Rolster and Samsung Galaxy. Earning first place in the regular season gave them a bye to the finals of the Spring Playoffs, where they faced SK Telecom T1. ROX entered as the favorites this time, but still lost 3-1, earning themselves second place for the spring split. This loss being the final straw for them, ROX became more determined than ever to finally win their first LCK title.

In the regular season of the summer split, they were once again able to finish 1st with a 15-3 record. This time around, their opponent in the final wasn't SK Telecom T1 like they expected; it was KT Rolster. In a very close series that became a classic, ROX was finally able to capture their first LCK title since they were formed in 3-2, thereby qualifying for the 2016 World as the first seed representative from LCK.

Their run through the World Group stage was fairly successful. ROX was placed in Group A along with G2 Esports, Counter Logic Gaming and Albus NoX Luna. They managed to make it out of the group stage as the #1 seed, after winning the tiebreaker match against ANX. In the knockout stage, ROX was seeded against EDward Gaming, China's #1 seed and #2 seed from Group C. The series went up to 4 games and ROX ended it in a 3-1 fashion. In the Semifinals, however, the team faced 2-time World Champion SK Telecom T1 again in a rematch of their 2015 World Final. After losing the first game, ROX pulled out an Ashe-Miss Fortune combo pick, a strategy that was so unorthodox since the meta pick at the time for support was usually either a Zyra or a Karma. To the surprise of many analysts and casters, ROX were able to win the next two matches. However, they were unable to close out the series and lost to SK Telecom T1 again for the third time on the big stage. This ended the team's run at 3rd-4th place.

2017 Season

During the 2017 LCK Spring Split, Rox Tigers was a mid tier team and finished the season 8-10, placing 6th in the standing and barely missing the playoffs behind MVP. That said, the team retained their spot for the 2017 LCK Summer Split.

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